File indexing completed on 2024-05-12 16:27:05

 /*
    SPDX-FileCopyrightText: 2020-2024 Laurent Montel <montel@kde.org>
 
    SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "flowlayout.h"
 
 #include <QStyle>
 #include <QWidget>
 
 static int smartSpacing(QObject *parent, QStyle::PixelMetric pm)
 {
     if (!parent) {
         return -1;
     } else if (parent->isWidgetType()) {
         auto pw = static_cast<QWidget *>(parent);
         return pw->style()->pixelMetric(pm, nullptr, pw);
     } else {
         return static_cast<QLayout *>(parent)->spacing();
     }
 }
 
 FlowLayout::FlowLayout(QWidget *parent)
     : QLayout(parent)
 {
 }
 
 FlowLayout::~FlowLayout()
 {
     clear();
 }
 
 int FlowLayout::horizontalSpacing() const
 {
     if (mHorizontalSpacing >= 0) {
         return mHorizontalSpacing;
     } else {
         return smartSpacing(parent(), QStyle::PM_LayoutHorizontalSpacing);
     }
 }
 
 void FlowLayout::setHorizontalSpacing(int horizontalSpacing)
 {
     if (mHorizontalSpacing != horizontalSpacing) {
         mHorizontalSpacing = horizontalSpacing;
         invalidate();
     }
 }
 
 int FlowLayout::verticalSpacing() const
 {
     if (mVerticalSpacing >= 0) {
         return mVerticalSpacing;
     } else {
         return smartSpacing(parent(), QStyle::PM_LayoutVerticalSpacing);
     }
 }
 
 void FlowLayout::setVerticalSpacing(int verticalSpacing)
 {
     if (mVerticalSpacing != verticalSpacing) {
         mVerticalSpacing = verticalSpacing;
         invalidate();
     }
 }
 
 QSize FlowLayout::sizeHint() const
 {
     return minimumSize();
 }
 
 QSize FlowLayout::minimumSize() const
 {
     const QMargins margins = contentsMargins();
     QSize size;
 
     for (const QLayoutItem *item : mItems) {
         size = size.expandedTo(item->minimumSize());
     }
 
     size += QSize(margins.left() + margins.right(), margins.top() + margins.bottom());
     return size;
 }
 
 void FlowLayout::addItem(QLayoutItem *item)
 {
     Q_ASSERT(!mItems.contains(item));
     mItems.append(item);
     invalidate();
 }
 
 QLayoutItem *FlowLayout::itemAt(int index) const
 {
     if (index >= 0 && index < mItems.count()) {
         return mItems[index];
     }
 
     return nullptr;
 }
 
 QLayoutItem *FlowLayout::takeAt(int index)
 {
     if (index >= 0 && index < mItems.count()) {
         auto *it = mItems.takeAt(index);
         invalidate();
         return it;
     }
 
     return nullptr;
 }
 
 int FlowLayout::count() const
 {
     return mItems.count();
 }
 
 Qt::Orientations FlowLayout::expandingDirections() const
 {
     return {};
 }
 
 bool FlowLayout::hasHeightForWidth() const
 {
     return true;
 }
 
 int FlowLayout::heightForWidth(int width) const
 {
     return doFlow(QRect(0, 0, width, 0), false);
 }
 
 void FlowLayout::setGeometry(const QRect &rect)
 {
     QLayout::setGeometry(rect);
     doFlow(rect, true);
 }
 
 void FlowLayout::clear()
 {
     while (QLayoutItem *item = takeAt(0)) {
         delete item;
     }
 }
 
 void FlowLayout::clearAndDeleteWidgets()
 {
     while (QLayoutItem *item = takeAt(0)) {
         item->widget()->deleteLater();
         delete item;
     }
 }
 
 int FlowLayout::doFlow(QRect rect, bool effective) const
 {
     const QMargins margins = contentsMargins();
     const QRect effectiveRect = rect.adjusted(margins.left(), margins.top(), -margins.right(), -margins.bottom());
     int x = effectiveRect.x();
     int y = effectiveRect.y();
     int highest = 0;
 
     for (QLayoutItem *item : mItems) {
         const QWidget *widget = item->widget();
 
         if (!widget->isVisibleTo(parentWidget())) {
             continue;
         }
 
         int hSpacing = horizontalSpacing();
         int vSpacing = verticalSpacing();
 
         if (hSpacing == -1) {
             hSpacing = widget->style()->layoutSpacing(QSizePolicy::Frame, QSizePolicy::Frame, Qt::Horizontal);
         }
 
         if (vSpacing == -1) {
             vSpacing = widget->style()->layoutSpacing(QSizePolicy::Frame, QSizePolicy::Frame, Qt::Vertical);
         }
 
         int widgetXPos = x + item->sizeHint().width() + hSpacing;
 
         if (widgetXPos - hSpacing > effectiveRect.right() && highest > 0) {
             x = effectiveRect.x();
             y += highest + vSpacing;
             widgetXPos = x + item->sizeHint().width() + hSpacing;
             highest = 0;
         }
 
         if (effective) {
             item->setGeometry(QRect(QPoint(x, y), item->sizeHint()));
         }
 
         x = widgetXPos;
         highest = qMax(highest, item->sizeHint().height());
     }
 
     return y + highest - rect.y() + margins.bottom();
 }
 
 #include "moc_flowlayout.cpp"